Lesson 37 Adding and Subtracting Decimals

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Presentation transcript:

Lesson 37 Adding and Subtracting Decimals

You can add a zero to help keep everything lined up Adding Examples: 4.55 + 11.3 Put the first number on the top of the second number and line up the decimals. You can add a zero to help keep everything lined up When adding or subtracting you always start from the right and work left. 4.55 + 11.3 15.85

Add a zero to line up everything 6.44 + 16 When there is not a decimal put one behind the number. Line up the decimal Add a zero to line up everything 6.44 + 16. 22.44

Subtracting Examples: 5.34 -2.08 5.34 -2.08 3.26 Put the first number on the top of the second number and line up the decimals. Different signs Take difference 5.34 -2.08 3.26

Add zeros to line up everything, then subtract 28 – 15.911 When there is not a decimal put one behind the number. Add zeros to line up everything, then subtract 7 9 9 28. -15.911 000 . 1 2 8 9

Essential Question: How do I add and subtract decimals? Always line up decimals Add and subtract like you always do Bring decimal straight down in your answers

The sum of each row, column, and diagonal must be the same. Magic Square 0.5 7 4.625 8.75 The sum of each row, column, and diagonal must be the same. 6.375 0.5 7 5.25 4.625 4 2.25 8.75 2.875 Sums to 13.875